Combined sharpening, sanding, and honing machine



Feb, 12, N57 A. RADASE 2,780,897

\ COMBINED SHARPENING, SANDING AND HONING MACHINE Filed Dec. 9, 1954? 2 Sheets-Shet 1 A. RADASE COMBINED SHARPENING; SANDING AND HONING MACHINE Filed Dec. 9, 1954 2 Sheets-Sheet 2 COMBINED SHARPENING, SANDING, AND HONIN MACHINE This invention relates to a machine for performance of various sanding, sharpening and honing operations, and was conceived and developed as a small portable machine for performing any desired combination of these functions, especially as applied to knives and small tools.

An object. of the invention has been to provide an unusually compact, simple and versatile machine for performing these functions.

A further object has been to provide a machine of this character in which a flat sanding belt surface is available for ordinary sharpening of small tools, but which may be adapted through a very simple adjustment for bevel grinding to produce curved sharpened surfaces where desired, by performing the sharpening operation against a portion of the sanding belt running around a pulley of the machine.

A further object has been to provide a machine of this character in which a pivoted cover plate overlies the sanding run of the sanding belt, and this cover plate is mounted for pivotail retraction into a position in which a portion of the sanding belt running over one of the pulleys is exposed to provide a sanding surface having the curvature of the pulley.

A further object of the invention has been to provide an apparatus in which the tool to be sharpened may be supported during sharpening at a variety of angles, by simple adjustment of a pivoted supporting plate.

A further object has been to provide an apparatus of this kind in which a dressing stone is conveniently mounted in close relationship to the sanding belt for performance of a combination of sanding and honing operations.

A further object has been to provide an apparatus of this kind, in which the dressing stone is mounted directly upon a pivoted handle, so that the machine may readily be transported through the handle provided by the dressing stone mounting.

A further object has been to provide a machine of this kind in which there is provided not only a very simple adjustable support for the tool to be sharpened by the sanding belt as discussed above, but also an opposing guide plate for guiding it into sharpening relationship to the belt. 7

A further object has been to provide a machine having any or all of the features discussed above and the further feature involving a mounting for the sanding belt by which it may be very readily removed and replaced.

A further object has been to provide a supporting base in the form of a spring-pressed pivoted supporting plate by which the sanding belt may be maintained under desired tension in its sanding run.

The manner in which these and other objects and advantages of the invention have been attained will be evident from reading of the following detailed description in the light of the attached drawing, in which,

Figure 1 is a perspective view of the machine of this invention with the side cover plate removed,

nited States Patent() 2,780,897 Patented Feb. 12, 1957 Figure 2 is a side elevation of the machine, with parts being shown in section,

Figure 3 is a cross-section on the line 3-3 of Figure 2,

Figure 4 is a detailed side elevation showing in broken lines the top cover plate swung back into alternative sanding position,

Figure 5 is a cross-section on the line 55 of Figure 2, and

Figure 6 is a cross-section on the line 66 of Figure 4.

The machine of the invention comprises a driving motor 10, a driving pulley 11 positioned laterally of the motor and secured in driving relation to the motor shaft, an idler pulley 12 longitudinally spaced from driving pulley 11, and an abrasive belt 13 en-trained over the driving and idler pulleys and having its outer surface coated with aluminum oxide or other suitable abrasive particles capable of effecting sharpening and sanding operations. A cover plate 14 may be secured at the side opposite the motor by a suitable wing nut 15, through bolt 16 to the inner side plate 17 of the sanding belt assembly. A curved guard plate 18 surrounds the sanding beilt through the major part of its extent, and serves together with cover plate 14 to cover most of the sanding belt from access during operation.

The upper surface of the abrasive belt 13 is its operative sanding run, and a supporting plate or platen 19 is provided beneath this run for the joint purpose of maintaining the belt taut and of serving as a resiliently mounted reaction platen to receive the pressure of the article being sanded or sharpened. To this end, the platen 19 is pivotally mounted at 20 through one of its side flanges 21, and is subjected to spring pressure at its opposite end through a leaf spring 22 secured at its lower end around the bolt 16 by which cover plate 14 is attached, and at its other end to the under side of the platen 19. The end of the platen 19 opposite to the pivotal mounting 20 is capable of arcua-te movement about this pivotal mounting as a center, by reason of the fact that it is secured somewhat loosely to side plate 17 through a screw 23 operating through an elongated slot 24 provided in the side flange 21 of the platen.

A tool guide plate 25 is mounted adjacent one end of the curved cover plate 18 in a position overlying the sanding run of the belt, and this guide plate 25 is bent to provide a portion 26 overlying the belt in adjacency there to, and an upstanding lip 27 which serves as a guide for the object being sanded or sharpened. In normal sanding or sharpening operations, the object being sanded or sharpened is supported upon the edge 28 of a supporting plate 29, with the portion to be sharpened nesting against the moving sanding belt, and guided into effective relationship to that belt by the upstanding lip 27 of the guide plate 25.

The supporting plate 29 is in the form of a hinged cover having side flanges 30, and is pivoted at 31 to the guard plate 18. A slot 32 is provided in the inner flange 30, and a set screw 33 passes through this slot and clamps this supporting plate in proper adjusted position in relation to the sanding belt, for operation of the machine, as illustrated in Figure 4. By reference to that figure it will be seen that the supporting surface for the article 34- to be sharpened may be adjusted upwardly or downwardly within substantial limits, while still clamping the plate in position through its slot 32 and screw 33.

The machine provides facilities not only for sanding or sharpening articles against the flat surface of the sanding belt, as discussed above, but also for sharpening them against a curved run of the sanding belt, as this passes around the pulley 12. To this end, the supporting plate or cover 29 may be swung rearwardly about its pivotal mounting 31 to a position in which a substantial part of the run of the sanding belt around the pulley 12 is exposed and the article to be sanded or sharpened may then be applied to the belt as it runs around this pulley to provide a curved edge.

The shaft of the pulley 12 is formed'as a horizontal extension of an arm 35, which is pivotally mounted at its opposite end within a bracket 36 secured to curved guard plate 18, as best illustrated in Figures 2 and 3 of the drawing. A forwardly extending arm 37 is secured to this pulley mounting, and the assembly is mounted for swinging movement about the axis provided by bracket 36,

through an are limited by slot 38 in the side plate 17 through which arm 35 extends as illustrated in Figure 3. The arm 37 is urged by the pressure of spring 39 reacting against abutment 40 into position in which the pulley 12 is held rearwardly, as illustrated in Figures 2 and 6, but this pulley may readily be moved to position in which the belt is released for removal from the machine and replacement, by simply manipulating the lever 35 to effect such movement of the pulley against the spring pressure, after the side cover plate 14 has been removed, and the supporting plate 30 pivoted rearwardly to the position illustrated in Figure 4.

Another feature of the invention consists in providing an abrasive dressing or honing stone 42 in position for conveniently honing the article treated by the abrasive belt 13 to complete the operationv The stone 42 is mounted in a holder 43 which is supported directly over the motor 10. This mounting is made to serve a dual purpose by supporting it in arms 44 which are pivotally mounted at 45, so that the mounting provides a handle by which the entire machine may be picked up and carried.

It will be seen that the provision of the honing stone 42 as an integral part of the machine in close proximity to the abrasive belt constitutes a very useful feature of the apparatus, since it enables the operator to hone the object being sharpened immediately after the dressing operation. This not only improves the quality of the final edge produced but it also enables the sharpening operation by the abrasive belt to be somewhat foreshortened, since the sharpening operation can be conveniently finished on the honing stone. It also enables the user of the tool to eliminate the objectionable wire edge so frequently present on the object being sharpened at the conclusion of a sharpening operation by an abrasive or sanding belt.

From the foregoing discussion it will be seen that a machine has been provided which possesses very considerable advantages in the type of work for which it has been conceived and developed. While only a single embodiment of the invention has been disclosed, it will be evident to those skilled in the art that various modifications and refinements are available, and I therefore wish it to be understood that the invention is not to be limited in interpretation except by the scope of the following claim:

I claim:

In a machine for performing sanding operations, the combination comprising a pulley-mounted abrasive belt, means mounted in driving relationship to the pulley mounting to actuate said belt to perform a sanding operation, a tool guide plate mounted above said belt and having a free edge with anupstanding lip adapted to engage a tool and guide its cutting edge against said belt, and a cover plate pivotalrly mounted for swinging movement upwardly vfrom a position directly overlying the sanding run of said'abrasive belt into a position exposing a portion of the abrasive belt running over one of the pulleys of the pulley-mounting, said cover plate having a free edge spaced from said upstanding lip to expose the portion of the belt lying therebetween and providing a supporting edge for a tool guided by said lip into engagement with said belt.

References Cited in the file of this patent UNITED STATES PATENTS 348,177 Totman Aug. 24, 1886 1,108,176 Hormel Aug. 25, 1914 2,222,361 Burns Nov. 19, 1940 2,222,966 Williams Nov. 26, 1940 2,375,604 'Williams May 8, 1945 2,566,809 Risley et *al. Sept. 4, 1951 2,637,952 Reed May 12, 1953 

